Method for manufacturing high pressure tank

Abstract

The present invention provides a method for manufacturing a high pressure tank having a reinforcing layer on an outer surface of a liner provided with dome portions at both end portions of a round tubular shaped body portion, the method including: a winding process of winding a fiber bundle containing a curable resin and having a predetermined tension on the outer surface of the liner; and a reinforcing layer forming process of forming the reinforcing layer by curing the curable resin contained in the fiber bundle wound around the outer surface, in which the winding process is performed so that the tensions of the fiber bundles at the both end portions are lower than a tension of the fiber bundle at a general portion of the body portion defined between the both end portions.

What is claimed is: 
     
         1 . A method for manufacturing a high pressure tank having a reinforcing layer on an outer surface of a liner provided with dome portions at both end portions of a round tubular shaped body portion, the method comprising:
 a winding process of winding a fiber bundle containing a curable resin and having a predetermined tension on the outer surface of the liner; and   a reinforcing layer forming process of forming the reinforcing layer by curing the curable resin contained in the fiber bundle wound around the outer surface, wherein   the winding process is performed so that the tensions of the fiber bundles at the both end portions are lower than a tension of the fiber bundle at a general portion of the body portion defined between the both end portions.   
     
     
         2 . The method according  claim 1 , wherein
 the winding process is performed by a hoop winding of the fiber bundle around the body portion of the liner.   
     
     
         3 . The method according  claim 1 , wherein
 the reinforcing layer is composed of a plurality of unit layers laminated on the outer surface of the liner, and   the unit layer is formed by arranging band-shaped fiber bundles in parallel in an axial direction of the liner.   
     
     
         4 . The method according  claim 3 , wherein
 the unit layers are independent of each other, and   the tensions of the fiber bundles at both end portions of the body portion are reduced to be lower than the tension of the fiber bundle at the general portion of the body portion.   
     
     
         5 . The method according  claim 4 , wherein
 the tensions of the fiber bundles of the plurality of unit layers laminated on the general portion of the body portion in the radial direction are reduced toward an outer circumferential side.